package cn.stylefeng.guns.core.util;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpServletRequest;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;

import net.bytebuddy.asm.Advice.This;
 
public class RequestToJsonToObjectUtils {
	
	public static JSONObject getRequestJsonObject(HttpServletRequest request) throws IOException {
		String json = getRequestJsonString(request);
		return JSONObject.parseObject(json);
	}
	 /***
     * 获取 request 中 json 字符串的内容
     * 
     * @param request
     * @return : <code>byte[]</code>
     * @throws IOException
     */
    public static String getRequestJsonString(HttpServletRequest request)
            throws IOException {
        String submitMehtod = request.getMethod();
        // GET
        if (submitMehtod.equals("GET")) {
            return new String(request.getQueryString().getBytes("iso-8859-1"),"utf-8").replaceAll("%22", "\"");
        // POST
        } else {
            return getRequestPostStr(request);
        }
    }
 
    /**      
     * 描述:获取 post 请求的 byte[] 数组
     * <pre>
     * 举例：
     * </pre>
     * @param request
     * @return
     * @throws IOException      
     */
    public static byte[] getRequestPostBytes(HttpServletRequest request)
            throws IOException {
        int contentLength = request.getContentLength();
        if(contentLength<0){
            return null;
        }
        byte buffer[] = new byte[contentLength];
        for (int i = 0; i < contentLength;) {
 
            int readlen = request.getInputStream().read(buffer, i,
                    contentLength - i);
            if (readlen == -1) {
                break;
            }
            i += readlen;
        }
        return buffer;
    }
 
    /**      
     * 描述:获取 post 请求内容
     * <pre>
     * 举例：
     * </pre>
     * @param request
     * @return
     * @throws IOException      
     */
    public static String getRequestPostStr(HttpServletRequest request)
            throws IOException {
        byte buffer[] = getRequestPostBytes(request);
        String charEncoding = request.getCharacterEncoding();
        if (charEncoding == null) {
            charEncoding = "UTF-8";
        }
        return new String(buffer, charEncoding);
    }
    /**
      * <b>json字符串转成object
      * </b><br><i>Description</i> :
      * @param jsonString
      * @param cls
      * @return T
      * <br>
      * <br><b>Throws</b> :
      * @date 2018年12月4日 上午9:22:13    <br><i>author</i> : dxl
     */
    @SuppressWarnings("unchecked")
	public static <T> T jsonStringToObject(String jsonString, Class cls) {
        T t = null;
        try {
            t = (T) JSON.parseObject(jsonString, cls);
        } catch (Exception e) {
            // TODO: handle exception
        }
        return t;
    }
    /**
      * <b>HttpServletRequest request中json直接转成object
      * </b><br><i>Description</i> :
      * @param request
      * @param cls
      * @return
      * @throws IOException T
      * <br>
      * <br><b>Throws</b> :
      * @date 2018年12月4日 上午9:39:24    <br><i>author</i> : dxl
     */
    @SuppressWarnings("unchecked")
	public static <T> T requestToObject(HttpServletRequest request, Class cls) throws IOException {
    	String jsonString = getRequestJsonString(request);
        T t = null;
        try {
            t = (T) JSON.parseObject(jsonString, cls);
        } catch (Exception e) {
            // TODO: handle exception
        }
        return t;
    }
    
    /**
      * <b>json字符串转成List
      * </b><br><i>Description</i> :
      * @param jsonString
      * @param cls
      * @return List<T>
      * <br>
      * <br><b>Throws</b> :
      * @date 2018年12月4日 上午9:22:19    <br><i>author</i> : dxl
     */
    @SuppressWarnings("unchecked")
	public static <T> List<T> jsonStringToObjectList(String jsonString, Class cls) {
        List<T> list = new ArrayList<T>();
        try {
            list = JSON.parseArray(jsonString, cls);
        } catch (Exception e) {
        }
        return list;
    }
    /**
      * <b>HttpServletRequest request中json直接转成List
      * </b><br><i>Description</i> :
      * @param request
      * @param cls
      * @return
      * @throws IOException List<T>
      * <br>
      * <br><b>Throws</b> :
      * @date 2018年12月4日 上午9:42:02    <br><i>author</i> : dxl
     */
    @SuppressWarnings("unchecked")
	public static <T> List<T> requestToObjectList(HttpServletRequest request, Class cls) throws IOException {
    	String jsonString = getRequestJsonString(request);
        List<T> list = new ArrayList<T>();
        try {
            list = JSON.parseArray(jsonString, cls);
        } catch (Exception e) {
        }
        return list;
    }
 
}
